PSI - Issue 28

Saiaf Bin Rayhan et al. / Procedia Structural Integrity 28 (2020) 1901–1908 Author name / Structural Integrity Procedia 00 (2019) 000–000

1906

6

9 10 11 12 13 14 15

10 12 14 16

A.

B.

2 4 6 8

Plain

Twill

Plain

Twill

Critical buckling load, N/mm

Critical Buckling Load, N/mm

0 , 2 0 , 3 0 , 4 0 , 5 0 , 6 0 , 7

0 , 6 0 , 6 4 0 , 6 8 0 , 7 2 0 , 7 6 0 , 8

Fiber volume fraction, V f

Yarn fiber volume fraction, Y f

11,4

12,5

C.

D.

11

11,5

10,6

10,5

10,2

9,5

9,8

8,5

Plain

Twill

Plain

Twill

Critical buckling load, N/mm

Critical buckling load, N/mm

9,4

7,5

0 , 1 8 8 0 , 1 9 6 0 , 2 0 4 0 , 2 0 8 0 , 2 1 6

0 , 5 0 , 7 5 1 1 , 2 5 1 , 5 1 , 7 5 2

Yarn spacing, mm

Fabric thickness, mm

Figure 4. Effect of micromechanical properties on the critical buckling load, A: Fiber volume fraction; B: Yarn fiber volume fraction; C: Fabric thickness; D: Yarn spacing.

5.4. Effect of yarn spacing Finally, an investigation is conducted to study the effect of yarn spacing on the critical buckling outcomes of the woven composite plates, Fig. 4 (D). From the illustration, it is observed that from 0.5 mm yarn spacing up until 1.25 mm, the critical buckling load for both plain and twill type plates increases significantly, while the maximum increment is calculated at the beginning interval (from 0.5 mm to 0.75 mm), around 10% and 13% for plain and twill type respectively. However, the rise of the critical buckling value starts to diminish after the yarn spacing value reaches 1.25 mm for the woven composites. Finally, at the interval of 1.75 mm to 2 mm, the increment is as minimal as 1.8% and 1.3% for plain and twill type respectively. 6. Conclusion A multiscale analysis was carried out to investigate the effect of various micromechanical properties on the buckling behavior of a 16-layer quasi-isotropic symmetric woven composite plate subjected to uniaxial compressive loading. Commercial FE code Ansys was employed to design and analyze both microscale and macroscale experiments. From the conducted parametric simulations, the following conclusions are made. 1. Increment of the fiber volume fraction would lead to an increment of the critical buckling load of the woven composite plate significantly. 2. Increment of yarn fiber volume fraction will cause the woven composite plate to buckle earlier. A linear relationship is established which suggests that for both plain and twill type woven composite plates, approximately 1% of buckling load will reduce with the increment of 1% yarn volume fraction. 3. Yarn thickness has no significant effect on the critical buckling load of the woven composite plate.